The membranous covering of the heart is the _______, which includes a loosely fitting pericardial sac composed of an inner _______ and an outer ________.
A)pericardium; parietal layer of serous pericardium; fibrous pericardium B)epicardium; fibrous pericardium; parietal layer of serous pericardium C)epicardium; parietal layer of serous pericardium; fibrous pericardium D)endocardium; parietal layer of serous pericardium; epicardium